Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

22 hosts · 232 ms

HostCertsFirst seenLast seen
preply.com 20 2026-04-29 2026-09-29
*.preply.com 20 2026-04-29 2026-09-29
b2b.preply.com 8 2026-04-22 2026-08-18
chat-static.preply.com 2 2026-04-14 2026-09-14
online-teaching-conference.preply.com 13 2026-05-27 2026-09-03
*.online-teaching-conference.preply.com 1 2026-09-03 2026-09-03
translate.preply.com 5 2026-06-02 2026-09-29
tracking.preply.com 3 2026-04-24 2026-09-24
b2btracking.preply.com 10 2026-05-17 2026-09-21
auth.preply.com 9 2026-06-08 2026-10-05
lp.preply.com 18 2026-05-10 2026-09-05
help.preply.com 1 2026-01-16 2026-01-16
b2bcalendar.preply.com 11 2026-05-17 2026-09-21
affiliates.preply.com 2 2025-07-23 2026-06-22
ablink.trans.preply.com 2 2026-04-11 2026-09-11
ablink.tips.preply.com 2 2026-04-12 2026-09-12
avatars.preply.com 2 2026-04-16 2026-09-16
status.preply.com 8 2026-04-19 2026-08-15
act-sat.preply.com 3 2026-03-25 2026-08-25
trust.preply.com 8 2026-05-12 2026-09-08
community.preply.com 6 2026-05-18 2026-09-13
quiz.preply.com 24 2026-06-01 2026-09-28

Programmatic access: API GET /v1/hosts/preply.com (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/preply.com.